File: post-message.html

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<!DOCTYPE html>
<meta charset="utf-8" />
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
  test_driver.set_test_context(parent);

  window.addEventListener("message", async (event) => {
    const {
      data: { action, data },
    } = event;
    const response = {};
    try {
      switch (action) {
        case "share":
          await test_driver.bless("share");
          await navigator.share(data);
          response.result = "unreached";
          break;
        case "canShare":
          response.result = navigator.canShare(data);
          break;
      }
    } catch (error) {
      response.result = "error";
      response.error = error.name;
    } finally {
      event.source.postMessage({ ...response, action }, "*");
    }
  });

  // send message to parent that we loaded
  function sendLoadMessage() {
    window.parent.postMessage({ action: "loaded" }, "*");
  }
</script>
<body onload="sendLoadMessage()"></body>